Concept: The question tests on the basics of Profit/Loss(Percentage)
The profit % will be the same irrespective of whether it is 1 apple or 100 apples as long as we take an equal number when calculating CP and SP.
let CP of 1 apple = 100
then SP of 1 apple = 125
Profit% = SP−CPCP∗100=125−100100∗100SP−CPCP∗100=125−100100∗100 = 25%